9... a7a5  10. b4b5  10... c6d8 The knight is ready to go to e6 and then f4 when Black can then play g7-g5 strengthening its position. Still, it's surprising that the computer already considers Black's position to be much better. Because Black can still castle on the queenside, things are worse for White, since with the inclusion of a5-b5, this flank is closed and Black has a free pass for an attack on the kingside. 11. b1d2  11... d8e6 